Abstract
We have developed long GdBa2Cu3O7−X (GdBCO) coated conductors by a multi-plume and multi-turn pulsed laserdeposition (MPMT-PLD) method and have successfully fabricated 32and 60.7 m long GdBCO coated conductors with a high critical current,Ic, and highdeposition rate. The Ic of the 32 and 60.7 m long GdBCO coated conductors were 205 A(Jc = 1.36 MA cm−2) and183 A (Jc = 1.45 MA cm−2), respectively, at 77 K and 0 T. In addition, they exhibited higherIc values in a magneticfield than a YBa2Cu3O7−X (YBCO) coated conductor: typically 20 A at 77 K and 3 T whilethe value for a YBCO coated conductor is 8 A. These highIc values are due to thesmaller number of a-axis oriented grains in GdBCO than in YBCO. Furthermore,the speed of production of the GdBCO layer was increased to10 m h−1 while that of the former YBCO coated conductor was3.75 m h−1. The material yield of long GdBCO layers using the MPMT-PLD method was about 26–28%. Thehigh Ic of GdBCO in a magnetic field, the high production rate and the high material yield arepromising for applications.
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